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# Triangle abc is an equilateral triangle bc equals 10 what is the length of CD?

Where is 'D'? Is it inside or outside the triangle?

7

# If a figure has four sides it is a quadrilateral?

YES!!!

However, quadrilaterals can have different names , depending on their characteristics.

Square

Reactangle

Rhombus

Parallelogram

Trapezium

Kite

# What is the sum of the interior angle measures of a 15 sided polygon?

Remember

Exterior angle = 360 / No. of sides.

Hence

Exterior Angle = 360//25 = 24 degrees,

It follows that the intertiot angle is 180 - 24 =156 degrees.

There are 15 interior angles

Hence 15 x 156 = 2340 degrees is the sum of the interior angles of a 'Pentadecagon'.

A reflex angle

# Should a pentagon have to have equal sides?

A pentagon is a FIVE sided plane figure.

Those five sides can be all the same length ; hence it is a REGULAR pentagon.

or the five sides can be of different lengths ' hence it is just pentagon.

# How many line segments in letter E?

Depending on how you choose to define a line segment, you may conclude that the letter E has 4 or 5 line segments.

# Can the sides of a right triangle be 16 30 and 34 in?

To test use PYTHAGORAS ; h^2 = a^2 + b^2

34' is the longest side (h) , hence 34^(2) = 1156

a & b are 16 & 30

Hence

16^() + 30^(2) = 256 + 900 = 1156 , which equatres with 34^(2) . Thereby satisfies the Pythagorean Equation. Hence it is a Right angled triangle.

So the sides 16,30, & 34 form a right triangle.

# What is the formula for finding the diameter of a circle when the circumference is given?

C = pi d

By algebraic rearrangement

d = C / pi

# How do you find radius with given circumference?

You're supposed to know that

Circumference = (pi) x (diameter)

Divide each side of this equation by (pi) :

Diameter = Circumference/pi

And you also know that Diameter = 2 x Radius .

Divide each side of that one by 2 :

Radius = Circumference/2 x pi .

and that's exactly what you need.

# What is 36 pi?

pi ~ 3.141592....

Hence 36 pi = 36 X 3.141592... = 113.0973355....

# How do you find 2 missing sides of a right triangle?

Two methods to try .

#1 Use pythagoras h^ = a^2 + a^2 NB THis is only good if you know that the two unknown sides are the same length.

#2

Use trigonometry (trig.) This is good if you know the hypotenuse and one of the angles.

Sine(angle) = opposite/ hypotenuse

Hence

opposite side = hypotenuse X sine(angle)

Similarly

adjacent side = hypotenuse X Cosine(angle)

Here is an example

If you known the hypotenuse is a length of '6' and the angle is 30 degrees.

Then

opposite = 6 X Sin(30)

opposite = 6 x 0.5 = 3

So the length of the oppisute sides is '3' units.

NB DO NOT make the mistakes of saying Sin(6 X 30) = Sin(180) Nor 6 x 30 , nor Sin(6) X 30 , nor any other combination.

You MUST find the SINE of the angle , then multiply it to the given length.

Similarly for Cosine and Tangent.

# Are all squares similar true or false?

True. If all sides are congruent, and each angle is 90 degrees(keep in mind that in a four sided polygon, it adds up to 360), then the polygon is a square. All the square's sides will be proportional to each of the other squares sides, which makes it similar.

For example, if one square has a side length of 2, and another has a side length of 4, then the proportion would be 2\4, or 1\2. Since each side is congruent, then each side would be proportional. If you are proving, the squares diagonal, then the square, then it would be still proportional. Remember it would be a 45-45-90 triangle, with two angle bisected, and one left alone. 45-45-90 triangles are equal to the proportion x-x-x \/(2) (square root of two). So 2\/2 would be proportional to 4\/4 proving that any combo in a square would make it similar.

I hope this helps :D

-AnonymousSaber

# Perimeter of a rectangle 5cm by 6cm?

It has 2 sides of 5 cm and 2 sides of 6 cm so the perimeter is 22 cm

# Is 3 cubed 27?

3 x 3 x 3 = 9 x 3 = 27 being correct

# The circle has a radius of 12cm What is the area of the shaded part?

Since there is no shaded part, the answer must be that its area is 0 square units.

# Where to find FREE solutions of Calculus by Thomas Finney 9th edition?

You would have to get the copy from the book publisher. Otherwise it is necessary to purchase the textbook for your uses.

Parallelogram

# What is the volume of a cube with length 7 cm?

It is: 7*7*7 = 343 cubic cm

circumcenter

51 degrees

# What shape has 2 square corners?

If, by square corners, you mean corners that are right angles, then any polygon with four or more sides can have two square corners. Furthermore, apart from near the corners, the lines need even be straight so the shape need not be a polygon. In the limit a semicircle has two right angles.

# How do you use five fives to make 41?

The only solution that I know of is a bit of a cheat:5*(5 + 5) - 5/(.5 recurring).

# If the radius of a circle is 12mm then what is the diameter?

d=2r, d=2x12mm=24mm